“The entire congregation of the assembly of Israel shall slaughter it.”
~ Exodus 12:6

Just as today we experience the Pesach Seder communally, so too the original Pesach offering was observed collectively.

But how did so many people all slaughter one little lamb?

They didn’t. Only one person did the slaughtering, but since he was designated to act on their behalf, he represented everyone. Clearly, an agent is equivalent to his appointer.

When we heed the advice of those who guide us we become their agents, and consequently, we become like them. Choose wisely.